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Keywords:

  • polymer blend solar cells;
  • polymer phase separation;
  • photoluminescence quenching;
  • energy transfer;
  • charge-carrier mobility
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Low-bandgap donor/acceptor polymer blend solar cells are fabricated. The device performance is optimized at a donor:acceptor blending ratio of 70:30 wt% to result in a short-circuit current density of 8.85 mA cm−2, a fill factor of 0.55, and an open circuit voltage of 0.84 V. The high PCE , which exceeds 4%, demonstrates the potential of polymer/polymer blend solar cells as an alternative to polymer/fullerene solar cells.